Ampere's Law & Magnetic Field of a Solenoid - Physics & Electromagnetism
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- čas přidán 15. 06. 2024
- This physics video tutorial provides a basic introduction into ampere's law and explains how to use ampere's law to derive the formula to calculate the magnetic field of a wire and the magnetic field of a solenoid. This video on electromagnetism contains 1 practice problem explaining how to calculate the magnetic field of a solenoid given the electric current and the number of turns in the solenoid.
Magnetic Force on a Current Carrying Wire:
• Magnetic Force on a Cu...
Magnetic Force on a Moving Charge:
• Magnetic Force on a Mo...
The Homopolar Motor:
• Physics - Homopolar Mo...
The Lorentz Force:
• Battery Powered Electr...
Magnetic Field of a Current Carrying Wire:
• Magnetic Field of a St...
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Magnetic Sensors - The Reed Switch:
• Magnetic Sensors - The...
Magnetic Force Between Two Parallel Wires:
• Magnetic Force Between...
Magnetic Field of a Toroidal Solenoid:
• Magnetic Field of a To...
Magnetic Field of a Moving Charge:
• Magnetic Field of a Mo...
____________________________________
Torque on a Loop - Magnetic Dipole Moment:
• Torque on a Current Lo...
The Hall Effect:
• Hall Effect Explained,...
Magnetic Flux:
• Magnetic Flux, Basic I...
Faraday's Law of Electromagnetic Induction:
• Faraday's Law of Elect...
Lenz's Law - Induced Current:
• Lenz's Law, Right Hand...
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It’s 1 hour and 36 minutes until my final exam, and I just now learned that two loops doubles the i enclosed, and that’s why the B formula can be derived for a solenoid
Did u pass
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Lol! Mine is exactly in 36 minutes
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Oh my god, after stressing how in the world can a solenoid's magnetic field can be explained ,without just memorizing formulas, I finally understand it comprehensively
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Exact solution in only 10 sec. Ty bro
well explained
Using the right hand rule of thumb, nice. There is even sigma notation lambda and some other neat ones, sometimes good symbol does it.
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How about taking a circular loop inside the solenoid? How does ampere's law explains it?(since inclosed current inside is 0 but we know B is not zero)
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I am familiar with vector calculus but this kind of stuff is still amazing. Solenoids are a magnific 'exploit', by bending the wire we are shaping the magnetic field to concentrate in the center.
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So is the magnetic field on the surface of the coil considered the same as the magnetic field inside the coil?
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How about correlation between diameter of wire, diameter of selenoid & magnetic field?
thanks.
Yes, I would love to see this as well.
Very good. Now my question is: That 0,26 T, equals what force in Newton ? I need to project an electroiman and so, know, how it will be, in terms of N, to LIFT 1 KG ?
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With all respect, a solenoid is a coil of wire sometimes containing a metal core. So, my question is, should the coil be always insulated from from the core? even if it doesn't have a metal core?
8:45 - take this a step further by calculating the force that a 0.26T magnetic field would exert on a spring to open a solenoid valve. What would be needed for this calculation?
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But I have question.
Is magnetic field of solenoid independent of the cross-sectional area of the solenoid?
Yes it is independent
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You can derive this formula using biot savart’s law too
Wait.....this wasn't a bob Ross tutorial. Good job sir
Using the summation rather than the integral makes much more sense... coming from someone who's shaky on calculus still
If the magnetic strength is always in relation to the number of turns per meter, then it seems like increasing the number of turns of wire would have no effect on the strength of the magnet. Assuming the diameter of the wire is unchanged and it can't be coiled any tighter, then increasing the number of turns will increase the length proportionally and they will cancel out. In your example, N=1,500 and l is 5cm, so n=30,000, but if N doubles to 3,000, then l will also double to 10cm and n is still 30,000 and the magnetic force doesn't change. How can this be right?
The strength of the field is to do with density. Even if the solenoid is longer, the density of the turns per coil remaining the same will lead to the same magnetic strength. Id think about how magentic strength is not related to the size of the solenoid
Where does the 4pi x 10^-7 come from? Thanks
its just a constant
I think they do tests and measure it
I did not get the I(en)= NI and you said that if one loop is 10 Amp then 2 loop 20Amp and so on........ but how? 🤔all the loops in series and same current flows in solenoid instead you increase the loops then current will decrease.
3:20 why you used rectangle instead of circle ?
i think we can take any closed loop (any shape) in space as long as we sum up the B//l along it. here by taking a rectangle you can only consider the line within the solenoid coz the other 3 lines are negligible, hence the b field within the solenoids center axis
so what would be the formula to find amp?
GOAT
Isn’t what you calculated Mag. Flux density since it’s in Tesla? Also wouldn't you end up with Tesla/Meter as your final units? Why wouldn't you just use B=uIN, since that would give you the total Tesla within the solenoid.
if the turns is 20 turns per centimeter it is still need to convert to meters?
how did you get u0 mu 0 for the example at the end of the video
Its a constant
Oh that makes sense thanks
❤
1:54 what happens to current enclosed variable(Ienc)
I keep getting .026T not .26T isn't 10 to the minus 7= .00000001?
SAME DUDE , JUST CHECKIN THE COMMENTS IF I HAVE THE SAME ISSUE.. AND I DONT KNOW WHY , I HAVE ALREADY CHECKED IF I HAVE CALCULATED IT WRONG BUT IT WASNT.
why would the field outside the solenoid be zero?
Why is the magnetic field that is perpendicular to a solenoid equal to zero?
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So the ampere law just show us the formula for solving the strength of magnetic field ?
what a minute, how about the area of the of the solenoid
, I don't think the length is all that matters.
The solenoids diameter doesn’t matter?
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how about an electric motor
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I liked it but u can have better graphics
Cannot understand the slurred English
still makes no sense. Only works with infinite length wire.
I think integral calculations are required for finite length wires
I"ve watched heaps of your videos and learned a lot but PLEASE... it is maGnetic, not maNetic. That was really distracting
You don't even explain the reason it is strong at the center. Very poorly explained
To explain it he would need to teach Faraday and Lenz's law, which would be later on in the course.